docs: def format_errors(self, errors, many):
          """Format validation errors as JSON Error objects."""
          if not errors:
              return {}
          if isinstance(errors, (list, tuple)):
              return {'errors': errors}
  
          formatted_errors = []
          if many:
              for index, errors in iteritems(errors):
                  for field_name, field_errors in iteritems(errors):
                      formatted_errors.extend([
                          self.format_error(field_name, message, index=index)
                          for message in field_errors
                      ])
          else:
              for field_name, field_errors in iteritems(errors):
                  formatted_errors.extend([
                      self.format_error(field_name, message)
                      for message in field_errors
                  ])
          return {'errors': formatted_errors}